what is the percent of O in CO2

Answer:

protons and neutrons

Explanation:

its on the assighnment

Protons and neutrons subatomic particles are primarily responsible for giving an atom its mass .

A proton is a positively charged particle that lies in the atomic nucleus .

The number of protons in the atomic nucleus is what determines the atomic number of an element .

It has a mass of  mass of 1.67262 × 10⁻²⁷ kg

An electron is a negatively charged particle  of an atom.

Electrons exist outside of  the atom nucleus. Each electron carries one unit of negative charge -1.602 x 10⁻¹⁹ coulomb .

Hence , protons and neutrons subatomic particles are primarily responsible for giving an atom its mass .

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Answer:

Mg --> Mg²⁺ + 2e

Explanation:

Redox reactions consists of both reduction and oxidation reactions.

one species gets oxidised and other species gets reduced, both reactions happen simultaneously giving rise to a redox reaction.

Oxidation reactions could be either loss of electrons or gain of oxygen.

in oxidation the oxidation number of the species will increase

reduction on the other hand is either gain of electrons or gain of hydrogen.

in reduction the oxidation number of the species will reduce

in this reaction the oxidation half reaction is

Mg --> Mg²⁺ + 2e

Mg is losing electrons therefore its being oxidised

Answer:

-1268 kJ

Explanation:

The molar enthalpy of combustion of C6H6 is -3170 kJ/mol

2C6H6(g) + 15O2(g) → 12CO2(g) + 6H2O(g)

Therefore;

when 1 mole of C6H6 undergoes combustion, an energy of -3170 kJ/mol is released.

Therefore; for 0.40 mole

= 0.4 × -3170 kJ

= -1268 kJ

Answer:

The guy above me is correct, but the next answers are -67.68 and exothermic

Explanation: edge

Answer:

[tex]\boxed{\text{B and C }}[/tex]

Explanation:

In a single-displacement reaction, one element exchanges partners with another element in a compound.

[tex]\textbf{A. } \rm Fe + 2HCl \longrightarrow FeCl_2 + H_2[/tex]

This is a single-displacement reaction, because the element Fe exchanges partners with H in HCl.

[tex]\textbf{B. } \rm KOH + HNO_3 \longrightarrow H_2O + KNO_3[/tex]

This is not a single-displacement reaction, because it is a reaction between two compounds.

This is a double displacement reaction in which the K⁺ and H⁺ cations change partners with the anions.

[tex]\textbf{C. } \rm Na_2S + 2HCl \longrightarrow 2NaCl + H_2S[/tex]

This is not a single-displacement reaction. It is another double displacement reaction, in which the Na⁺ and H⁺ cations change partners with the anions.

[tex]\textbf{D. } \rm Ca + 2HOH \longrightarrow Ca(OH)_2 + H_2[/tex]

This is a single-displacement reaction, because the element Ca exchanges partners with H in H₂O.

[tex]\boxed{\textbf{B and C }}[/tex] are not single-displacement reactions.

An excess of copper may dissolve in a solution during a redox reaction with, for example, a silver nitrate solution where copper wire oxidizes to form copper(II) ions, imbuing the solution with a blue color. Similar conditions can occur in the decomposition of copper from copper ore, chalcocite.

Too much copper might go into solution under certain conditions, most commonly in the presence of a chemical reaction where copper is oxidized. For example, when copper wire is placed in a solution containing dissolved silver salt, it undergoes a redox reaction. During this reaction, copper oxidizes to form copper(II) ions, Cu²+ (aq), resulting in a characteristic blue color in the solution due to the dissolved copper ions.

This is the case when the silver nitrate solution reacts with the copper wire. The silver ions are reduced to elemental silver which deposits on the copper wire while copper ions dissolve in the solution. This process spontaneously occurs making the solution more and more blue in color.

An important source of copper is from copper ore, chalcocite, which upon heating decomposes to form copper and sulfur. This is another scenario when copper might dissolve in a solution if the surrounding conditions favor this particular reaction.

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Answer:

The right answer is V = 17.2 mL

Explanation:

No. of moles = C * V

where,

C is the concentration in morality and

V is the volume in liter

so you can calculate the volume using:

V = (No. of moles / C) = (0.0131 mol / 0.763 mol/L)

V = 0.0172 L

 V = 0.0172 L * (1000 mL / 1 L)

  V = 17.2 mL

So, the right answer is V = 17.2 mL

Answer:

These examples could be written as chemical reactions, but are more generally considered to be endothermic or heat-absorbing processes: Melting ice cubes. Melting solid salts. ... Converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes.

Explanation:

We have that an example of an endothermic reaction is given as

From the question we are told

Which reaction is an example of an endothermic reaction?

Generally an endothermic reaction is a reaction where heat energy is absorb from the air in to a system.

Generally it cause a reduction in the temperature of a system and can be found in processes like

Therefore

An example of an endothermic reaction is given as

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Answer:

Explanation:

The Octane rating is the % Octane in the grade that you are buying. In the United States, the octane rating of the cheapest gas is around 85%. In Canada, it is about 87% which in the states is the mid grade.

As soon as you take out the nozzle from its container, you have to press a large colored button to pick the octane rating. The button is so large and the writing is so limited, that you cannot miss the grade. Usually they are put together on the pump like this

87  89  91

I've given you the Canadian numbers; I'm not sure what they are in the US, but the numbers I've used are pretty close.

Answer:

Independed Variable:

food, water, container

dependent variable:

temperature

Hypothesis:

That there are less chirps if temperature is lower

constants:

food, water, container

repeated trials:

10 crickets and 10 containers, 10x accurate than using 1 and 1

control:

Crickets and containers

Answer:

True

Explanation:

The amount of solar energy a particular place receives is directly dependent on the directness of the sunlight. This is like this because the more direct the sunlight is , the more concentrated at smaller area it is, thus warming the area more, and the less direct the sunlight is, the more dispersed the sunlight is, and the area is heated much less. The directness of the sunlight depends on the inclination of the Earth, as well as the shape of the Earth. The inclination makes certain areas be more exposed to the sunlight in part of the year, and than be less exposed in the other part of the year. The shape of the Earth is directly influencing the angle by which the sunlight falls, the lower the latitude, the more direct the sunlight, the higher the latitude, the less direct the sunlight.

Answer:

T

Explanation:

Answer:

1. C. Chemical bond

2. A. Chemical reaction

3. Product

4. C. Balanced

5. B. Atoms of the same kind are of equal number on either side of the arrow

Explanation:

A chemical bond is a bond between two or more atoms. There are different types of chemical bonds, but the one that the question is pertaining to is called a covalen bond. A covalent bond occurs when the atoms are sharing electrons.

2. A chemical reaction is characterized by the production of light and/or heat, and a change in color in the product. By definition, it is the process where one or more substances react to produce one or more products.

3. When one or more reactants react with each other, it creates another substance or substances called products. In the case of your question, sodium  reacts with chlorine (these are your reactants), which produces the product sodium chloride, which is a compound.

4. By definition, a balanced equation is an equation where the number of atoms of each element in the reactants are equal to the number of atoms of each element in the product.

ex.

Reactants        Product

Na + Cl      →      NaCl

Na = 1                Na = 1

Cl = 1                 Cl = 1

5. As explained above and shown, you can see that the number of atoms of each element in the reactants is equal to the number of each element in the product. So this means that the equation is balanced.

Answer:

1chemical bond 2chemical reaction 3 reaction 4 atomic 5atoms of the same kind ate not of equal number on either side of the arrow

Answer:

[He]: 2s² 2p⁵.

[Ne]: 3s².

[Ar]: 4s² 3d¹⁰ 4p².

[Kr]: 5s² 4d¹⁰ 5p⁵.

[Xe]: 6s² 4f¹⁴ 5d¹⁰ 6p².

Explanation:

He contains 2 electrons fill 1s (1s²).

So, [He] can be written before the electronic configuration of 2s² 2p⁵.

Ne contains 10 electrons fill (1s² 2s² 2p⁶).

So, [Ne] can be written before the electronic configuration of 3s².

Ar contains 18 electrons is configured as ([Ne] 3s² 3p⁶).

So, [Ar] can be written before the electronic configuration of 4s² 3d¹⁰ 4p².

Kr contains 36 electrons is configured as ([Ar] 4s² 3d¹⁰ 4p⁶).

So, [Kr] can be written before the electronic configuration of 5s² 4d¹⁰ 5p⁵.

Xe contains 54 electrons is configured as ([Kr] 5s² 4d¹⁰ 5p⁶).

So, [Xe] can be written before the electronic configuration of 6s² 4f¹⁴ 5d¹⁰ 6p².

Answer:

This is the Order :)

For Plato

Answer:

The right choice is "HNO₃ + KOH → KNO₃ + H₂O​"

Explanation:

acid-base neutralization reaction is a reaction in which acid react with base to form salt and water.

This is a reaction between metal (Sn) and acid (HF)

    2. C₂H₄ + 3 O₂ → 2 CO₂ + H₂O

This is a combustion reaction

    3. MgCl₂ + Ca(OH)₂  →  Mg(OH)₂ + CaCl₂

This is a simple displacement reaction between salt (MgCl₂) and base (Ca(OH)₂).

    3. HNO₃ + KOH → KNO₃ + H₂O

This is a acid-base neutralization reaction in which acid (HNO₃) react with base (KOH) to form salt (KNO₃) and water (H₂O).

So, the right choice is "HNO₃ + KOH → KNO₃ + H₂O​"

Answer:

63.86 mg

Explanation:

Molar mass is the mass of 1 mol of compound / atom.

molar mass of the compound is - 310 g/mol

mass of 1 mol is - 310 g

therefore mass of 2.06 x 10⁻⁴ mol is - 310 g/mol x 2.06 x 10⁻⁴ mol = 0.06386 g

mass of calcium phosphate is - 63.86 mg

Final answer:

To find the mass of 2.06 x 10⁻⁴ moles of calcium phosphate (Ca₃(PO₄)₂), calculate the formula mass using atomic masses of calcium, phosphorus, and oxygen. The formula mass of calcium phosphate is 310.18 g/mol. Multiplying this by the moles gives you 0.0639 grams of calcium phosphate.

Explanation:

To calculate the mass in grams of 2.06 x 10⁻⁴ moles of calcium phosphate (Ca₃(PO₄)₂), you must know the formula mass of calcium phosphate. The empirical formula indicates the compound contains three calcium ions (Ca⁺²) and two phosphate ions (PO₄⁻³). The formula mass is calculated by adding together the atomic masses of the constituent atoms: three calcium atoms, two phosphorus atoms, and eight oxygen atoms.

The atomic masses are approximately 40.08 g/mol for calcium, 30.97 g/mol for phosphorus, and 16.00 g/mol for oxygen. Calculating the formula mass, we have:

3(Calcium) + 2(Phosphorus) + 8(Oxygen) = 3(40.08 g/mol) + 2(30.97 g/mol) + 8(16.00 g/mol) = 310.18 g/mol

Now, to find the mass of 2.06 x 10-4 moles of calcium phosphate:

2.06 x 10⁻⁴ moles x 310.18 g/mol = 0.0639 grams

Therefore, there are 0.0639 grams of calcium phosphate in 2.06 x 10⁻⁴ moles of the compound.

Answer:

You would expect their DNA to be more similar.

Explanation:

You would expect this because they're more closely related and have had fewer time for mutations to occur.

DNA of two closely related organisms would be more similar, while DNA of two distantly related organisms would be less similar.

When you compare the DNA of two closely related organisms, you would expect their DNA to be more similar. Closely related organisms share a recent common ancestor, which means they have had less time for genetic differences to accumulate. As a result, their DNA sequences are more likely to be similar. On the other hand, when you compare the DNA of two distantly related organisms, you would expect their DNA to be less similar. Distantly related organisms have had more time for genetic differences to accumulate, resulting in more differences in their DNA sequences.

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Answer:

1. to bend ==>  refract

2. not allowing light to pass through   ==>  opaque

3. only partially clear ==> translucent  

4. clear  ==>  transparent

Explanation:

1. to bend ==>  refract

When a substance (like water) or a surface (like a mirror) changes the direction of the light, it refracts it.

2. not allowing light to pass through   ==>  opaque

Usually a solid but also a thick/dark liquid can be an opaque barrier preventing the passage of light.

3. only partially clear ==> translucent  

Think about a white plastic or a film-coated glass pane, they will let you see there's light on the other side, but not letting it pass through completely.

4. clear  ==>  transparent

Think like a window or a anything similar that allows the light to pass through without any significant obstruction.

Answer:

1. to bend ==>  refract

2. not allowing light to pass through   ==>  opaque

3. only partially clear ==> translucent  

4. clear  ==>  transparent

Explanation:

Answer:Dynamic Equilibrium Examples. Any reaction will be in dynamic equilibrium if it's reversible and the rates of the forward and reverse reactions are equal. For example, say that you prepare a solution that is saturated with an aqueous solution of NaCl.

Explanation:

Answer:

2,4,5

Explanation:

on edg

Answer:

[tex]1mole=6.02x10^{23} unit[/tex] (Avogadro constant)

Explanation:

It is known by the name of mole (mol) to one of the fundamental physical magnitudes that contemplate the International System of Units. This unit is used to measure the quantity of all kinds of substances present in a given system.

The mole, experts say, reflects the amount of substance that has a specific number of entities of elementary character as atoms can be found in twelve grams of carbon-12. This means that the number of elementary units (as in the case of atoms, molecules or ions, for example) that are reflected in a mole of substance is a constant that has no direct relationship with the type of particle or material in question. This amount is known as Avogadro's number.

This constant, baptized in homage to the scientist of Italian origin Amedeo Avogadro (1776-1856), allows to count microscopic particles from macroscopic measurements (as it is the case of the mass).

In chemistry, a mole consists of exactly 6.022 × 10²³ particles, which can be atoms, molecules, ions, or electrons. This quantity is known as Avogadro's number. Option A is correct.

The number of particles in a mole is a fundamental concept in chemistry, directly associated with the Avogadro's number. One mole of any substance, be it atoms, molecules, ions, or electrons, contains exactly 6.022 × 10²³ of those particles.

This specific value is selected for its utility in linking the macroscopic measurements that scientists can easily work with, to the microscopic scale of atoms and molecules which are too small to interact with directly.

This value (6.022 × 10²³) also represents the bridge between the molecular scale and the scale of chemical reactions observable and measurable in the laboratory. It's because every mole of substance, due to this number, will have a mass in grams equal to its molecular (or atomic) mass which is a direct translation of microscopic properties to macroscopic quantities that can be measured.

Hence, A. is the correct option.

The complete question is:

How many particles are in a mole?

A. 6.02 × 10²³

B. 23 × 10⁶

C. 6.02 × 23¹⁰

Answer:

Radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold the nucleus together due to an excess of either protons or neutrons.

Hope this helps!

Answer:

It happens when a heavy nucleus is bombarded with neutrons, so it becomes unstable and decomposes into two nuclei.

Explanation:

This is known by the term nuclear fission, which is a reaction by which a heavy nucleus, when bombarded with neutrons, becomes unstable and divides into two nuclei, of sizes of the same order of magnitude, there is a high release of energy and emits two or three neutrons. These neutrons can lead to more fissions by interacting with other fissile nuclei.

will not be a practical source of energy on Earth

According to most scientists, cold fusion will not be a practical source of energy on Earth. Option 1 is correct.

Cold fusion is a hypothetical type of nuclear fusion that would occur at or near room temperature. If it were possible to achieve cold fusion, it would be a virtually unlimited source of energy. However, there is no scientific consensus that cold fusion is actually possible, and there have been many failed attempts to reproduce the results of early experiments.

Most scientists believe that cold fusion will not be a practical source of energy is that it would require very high pressures and temperatures to initiate the fusion reaction. These conditions are difficult to achieve and maintain in a laboratory setting, and it is not clear how they could be scaled up to a commercial level.

Another problem with cold fusion is that it would likely be very expensive to produce. The materials and equipment needed to create the high pressures and temperatures would be very costly, and the energy output would probably be relatively low. Option 1 is correct.

The complete question is

According to most scientists, cold fusion

1. Will not be a practical source of energy on Earth

2. Would be a practical source of energy on Earth if it were less expensive

3. Will be a practical source of energy on Earth within the next few decades

4. Will always continue to be a practical source of energy on Earth

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Answer:

4.88 x 10²⁴atoms

Explanation:

Given parameters:

Number of moles of oxygen = 8.1moles

Problem:

To find the number of atoms in 8.1moles of oxygen.

Method in solving the problem:

We know that a mole of a substance contains Avogadro’s number of particles which is 6.02 x 10²³

The particles can be molecules, atoms, etc.

Solution:

From the concept of mole,

Number of atoms =

number of moles x 6.02 x 10²³

Number of atoms = 8.1 x 6.02 x 10²³

Number of

atoms of oxygen = 48.8 x 10²³ atoms

= 4.88 x 10²⁴atoms

Answer:

there are 9.9957 mol O2 in 340 g H2O2

Explanation:

reaction:

⇒ mol H2O2 = 340 g H2O2 * ( mol H2O2 / 34.0147 g H2O2 ) = 9.9957 mol

⇒ mol O2 = 9.9957 mol H2O2 * ( mol O2 / mol H2O2 ) = 9.9957 mol

Answer:

64.15 mL.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

V₁T₂ = V₂T₁

V₁ = 65.0 mL, T₁ = 92.4°C + 273 = 365.4 K.

V₂ = ??? mL, T₂ = 87.6°C + 273 = 360.6 K.

∴ V₂ = V₁T₂/T₁ = (65.0 mL)(360.6 K)/(365.4 K) = 64.15 mL.

Answer:

0.448 atm

Explanation:

we can use the ideal gas law equation to find the pressure of nitrogen gas

PV = nRT

where

P - pressure

V - volume

n - number of moles of gas

R - universal gas constant - 0.08206 L.atm/mol.K

T- temperature in kelvin -   -25.0 °C + 273 = 248 K

substituting the values in the equation

P x 15.0 L = 0.33 mol x 0.08206 L.atm/mol.K x 248 K

P = 0.448 atm

the pressure of gas is 0.448 atm

The study of chemicals and bonds is called chemistry. According to the law of thermodynamics, the temperature is the move from the high system to the low system.

The correct answer is 0.448 atm.

The formula used to solve the question is as follows:-

where,

Placing all the values in the equation.

[tex]P * 15.0 L = 0.33 mol * 0.08206 * 248 K P = 0.448 atm [/tex]

Hence, the pressure of a gas is 0.448 atm

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The controversy over lunar craters involves two main theories: volcanic activity and meteoric impacts.

The controversy surrounding lunar craters primarily focuses on their origin. One theory suggests volcanic activity akin to terrestrial calderas, such as Crater Lake in Oregon. However, this theory has largely been abandoned due to the lack of lava flows and insufficient debris around lunar craters to suggest volcanic origins. Instead, many scientists now support the impact theory, which proposes that these craters were formed by the collision of meteorites with the moon's surface. Significant objections arise from the observation that most lunar craters appear round, as if struck by objects falling directly towards the moon. Critics argue that meteorites, which typically travel at high velocities, would more likely strike at oblique angles, creating elongated gouges rather than round craters.

Despite these objections, the impact theory is supported by the presence of features such as rays extending from the craters, indicative of high-energy impacts that pulverize rock into powder and eject it across the moon's surface. Large craters, such as the Aitken Basin, and maria on the Moon further challenge both volcanic and impact theories. The Aitken Basin for example, is vast, and maria demonstrate how large impacts can penetrate deep enough to allow lava flow from the lunar interior to fill basins. Additionally, when comparing Earth to other celestial bodies, we see fewer craters on our planet due to atmospheric and geological activity. This difference helps in understanding Earth's unique history.

Answer:

A chemical equation that is balanced will help you to determine how much product they will produce from their reactants.

Hope this helps :)

Have a great day !

5INGH

Explanation:

Answer:

Thermal decomposition reaction.

Explanation:

Solid mercury(II) oxide is decomposed with heating into liquid mercury and oxygen gas. This reaction takes place at a 600-700°C.

The balanced chemical reaction is:

2HgO  →  2Hg  +  O₂.

Considering the definition of decomposition reaction, the reaction HgO → Hg + O₂ is a thermal decomposition reaction.

A single substance decomposes through a reaction called decomposition, producing two or more diferent compounds. That is, in this type of reaction two or more compounds are formed from a compound.

The atoms that make up a compound are separated to give the products according to the formula:

AB → A + B

This type of reaction can occur spontaneously or caused by certain external factors, such as heat. So, there are 3 types of decomposition reactions:

The reaction HgO → Hg + O₂ is a thermal decomposition reaction where mercuric oxide (HgO) decomposes on heating to give mercury (Hg) and oxygen (O₂​).

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The volume (in mL) required to make 1 L of the solution is 200 mL

M₁V₁ = M₂V₂

2 × V₁ = 0.4 × 1000

2 × V₁ = 400

Divide both side by 2

V₁ = 400 / 2

V₁ = 200 mL

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Final answer:

To prepare 1 liter of a 0.400 M NaCl solution from a 2.00 M NaCl solution, you need 200 milliliters of the 2.00 M solution, calculated using the dilution formula M1V1 = M2V2.

Explanation:

To determine how many milliliters of a 2.00 M NaCl solution are required to make 1 liter of a 0.400 M NaCl solution, we can use the dilution formula M1V1 = M2V2, where M1 is the molarity of the initial solution, V1 is the volume of the initial solution, M2 is the molarity of the final solution, and V2 is the volume of the final solution

In this case, we have:

M1 = 2.00 M (initial molarity of NaCl)

M2 = 0.400 M (desired molarity of NaCl)

V2 = 1 liter = 1000 mL (desired volume of final solution)

To find V1, we rearrange the equation: V1 = (M2 × V2) / M1.

Substituting in the known values, we get: V1 = (0.400 M × 1000 mL) / 2.00 M = 200 mL.

So, you would need 200 milliliters of the 2.00 M NaCl solution to prepare 1 liter of a 0.400 M NaCl solution.

Answer:

a.) 22.4 L Ne.

Explanation:

It is known that every 1.0 mol of any gas occupies 22.4 L.

For the options:

It represents 1.0 mol of Ne.

using cross multiplication:

1.0 mol occupies → 22.4 L.

??? mol occupies → 20 L.

The no. of moles of (20 L) Ar = (1.0 mol)(20 L)/(22.4 L) = 0.8929 mol.

using cross multiplication:

1.0 mol occupies → 22.4 L.

??? mol occupies → 2.24 L.

The no. of moles of (2.24 L) Xe = (1.0 mol)(2.24 L)/(22.4 L) = 0.1 mol.

Answer:

= 498.13 mmHg

Explanation:

Using the combined gas law;

P1V1/T1 =P2V2/T2

in this case; P1 = 725 mmHg, V1 = 375 mL and T1 = 25°C + 273 = 298 K

P2 = ?  V2 = 500 mL and T2 (standard temperature) = 0°C + 273 = 273 K

P2 = P1V1T2/T1V2

     = (725 × 375 × 273)/(298 × 500)

     = 498.13 mmHg